Fraud Transaction

Location/place: Pune/Delhi

Name of company/service: HDFC credit card

I got an sms on 01 july 12 as below :
Your trx id debited to HDFC Bank Card for Rs. 20503.00 in ETSAFE POS D at POS 5241110000300850 N on 01-july-2012 04:34 PM. This is not an authenticated trx as per RBI Mandate effective 1 May 12.

I haven’t done any transaction and they hold me liable for this.I complied with all the procedures of HDFC(got the card within 15 minutes of the transaction,submitted dispute form and followed up with HDFC risk control unit/customer care/helpdesk and managers. I was told that the matter would be sorted out within 60 days from the date of transaction.But nothing was done and I was kept liable for this fraud transaction.
I worked at tech mahindra from 2010 till july 2012 in pune and then moved to IIT Delhi for pursuing higher studies.

Now they have sent a notice at my home address and I along with my family are mentally harassed.

I kindly request you to please take some action this.

I confirm that this transaction is fraudulent and I haven’t involved in such transaction.

Awaited for the kind reply with a solution ASAP.